Reproducibility of intra-operative measurement of the mechanical axes of the lower limb during total knee replacement with a non-image-based navigation system

Figures & data

Figure 1. Intra-operative view of the femoral, tibial and ankle localizers.

Figure 2. Display of axes on the monitor.

Table I.  Results.

Case N°	Coronal mechanical femoro-tibial angle in maximal extension			Saggital mechanical femoro-tibial angle in maximal extension			Coronal mechanical femoro-tibial angle at 90° flexion
	Surgeon 1		Surgeon 2	Surgeon 1		Surgeon 2	Surgeon 1		Surgeon 2
	1st registration	2nd registration		1st registration	2nd registration		1st registration	2nd registration
1	14	14	14	−8	−7	−8	8	8	8
2	7	5	8	−1	2	−3	5	4	6
3	6	6	5	2	4	4	19	19	19
4	5	5	5	6	4	5	7	7	7
5	7	7	7	1	2	1	4	4	4
6	9	9	9	5	5	4	17	17	17
7	−1	−1	−1	8	9	9	5	4	4
8	7	7	7	17	18	17	10	9	10
9	6	6	6	8	7	9	12	12	13
10	10	9	10	−5	−6	−6	11	10	9
11	10	9	9	−6	−3	−3	7	7	7
12	−9	−9	−10	11	11	12	−3	−2	−2
13	4	4	4	3	2	3	10	10	9
14	−18	−17	−16	3	3	3	−12	−12	−12
15	3	4	4	13	15	16	1	0	0
16	0	1	0	14	14	13	7	7	7
17	4	3	4	−5	−4	−2	5	5	5
18	7	7	6	1	2	2	14	15	15
19	0	0	0	9	8	11	6	6	6
20	6	6	6	14	13	13	6	6	6